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Acrostichum Thelypteris, L in n æ u s , Sp. Pl., p. 1528.
Polypodium Thelypteris, L in næ u s , “ Mantissa, p. 505.”
Polystichum Thelypteris, R oti-i , “ Fl. Germ., iii., p. 7 7 .” — Koci-i, Syn. FI.
Germ., ed. iii,, p. 733.
Nephrodium Thelypteris, D e s v a u x , “ in Mém. Soc. Linn., vi., p. 257.” —
H o o k e r , Brit. Ferns, t. 1 3 ; Sp. Fil., iv., p. 8 8 .— H o o k e r &
B a k e r , Syn. F il, p. 271.
Lastrea Thelypteris, P r e s l , T e n t . P t e r id ., p . 7 6 . — M o o re , N a t . P r . B r i t .
Ferns, t. xxix.
Dryopteris Thelypteris, G r a y , Manual, ed. i., p. 630.
Thelypteris palustris, S ci-iot t, Gen. P'il. (with a plate).
Var. SQUAMIGERUM.— Midribs bearing a few ovate scales beneath;
indusium beset with stalked glands and slender hairs ; otherwise as in
the type,
Aspidium Thelypteris, ¡3 squamigerum, S c i i l e c h t e n d a l , Adumbr. PL, p. 2 3 ,
t. xi. — K u n z e , PI. Acotyl. Afr. Aust. Reccns. Nov., p. 67.
Aspidium squamigerum, Fée, 8"“ Mém., p. 104.
Nephrodiuni Thelypteris, squamulosum, J. D. H o o k e r , Plandb. of N. Z.
Flora, p. 777.
Lustrea Fairbankii, B ed d om e ( ! ) , “ F il. B r i t . In d ., t. 2 5 4 .”
H a b .— Very common in marshes and wet places, but sometimes in
dry ground, from Lake Winnipeg, British America, and New Brunswick,
to Louisiana and Florida. Europe, Siberia, Mantchooria, and Himalayan
India. The variety occurs in South Africa, New Zealand, and Southern
India.
D e s c r i p t i o n . — The root-stock is very slender, nearly black,
- stock, the newest portion of which bears a few short
stems an inch long or less, which would naturally be developed
into fronds the coming year.
The stalks are commonly a little longer than the frond,
slender, and naked, except for a few scales which soon disappear.
The stalk is roundish on the back, furrowed in front,
and contains near the base two oval fibro-vascular bundles, as
Milde has observed ; but higher up the two arc united into
one, which is concave anteriorly, and contains three internal
vascular projections from the concave side, two of them directed
obliquely towards the edges of the bundle, and one
pointed towards the middle of the opposite curvature.
The frond sometimes varies in length from a very few
inches to nearly three feet ; but commonly it is about a foot
long, and four or five inches wide. Such a frond has about
twenty to thirty pinnæ on each side, sometimes regularly arranged
in pairs to the very apex, but more frequently more
or less alternate. The lower two or three pairs are usually
but little shorter than those above them ; but fronds arc occasionally
found in which they are conspicuously reduced. One
such is figured by Moore, at Plate X X IX . of the Nature-printed
British F e rn s ;’ and I have similar fronds from various places
in America. The texture of the fronds is slightly heavier than
in the New York shield-fern, but still membranaceous. The
fronds wither at the first frost, and decay during the winter
almost devoid of chaff, and creeps for many inches just beneath
the surface of the ground. The stalks are scattered along the ' The left-hand figu:
ent work-
The folio edition is always referred to in the presroot
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